Anthony Edward Stark is a fictional character primarily portrayed by Robert Downey Jr. in the Marvel Cinematic Universe (MCU) media franchise—based on the Marvel Comics character of the same name—commonly known by his alias, Iron Man. Stark is initially depicted as an industrialist, genius inventor, and former playboy who is CEO of Stark Industries. Initially the chief weapons manufacturer for the U.S. military, he has a change of heart and redirects his technical knowledge into the creation of mechanized suits of armor which he uses to defend Earth.

Robert John Downey Jr. is an American actor. His films as a leading actor have grossed over $14 billion worldwide, making him one of the highest-grossing actors of all time. Downey's career has been characterized by some early success, a period of drug-related problems and run-ins with the law, and a surge in popular and commercial success in the 2000s. In 2008, Downey was named by Time magazine as one of the 100 most influential people in the world. From 2013 to 2015, he was listed by Forbes as Hollywood's highest-paid actor.